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Date: Tue, 28 Nov 2017 12:20:32 -0800
From: Kees Cook <keescook@...omium.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: "Theodore Ts'o" <tytso@....edu>, Djalal Harouni <tixxdz@...il.com>, Jonathan Corbet <corbet@....net>,
James Morris <james.l.morris@...cle.com>,
LSM List <linux-security-module@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Geo Kozey <geokozey@...lfence.com>
Subject: Re: Re: [PATCH v5 next 5/5] net: modules: use
request_module_cap() to load 'netdev-%s' modules
On Tue, Nov 28, 2017 at 12:12 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Tue, Nov 28, 2017 at 12:08 PM, Kees Cook <keescook@...omium.org> wrote:
>>
>> Linus, are you okay with this series if the global sysctl gets dropped?
>
> So really, it's not the "global sysctl" as much as the "global
> request_module()" that annoys me.
>
> I'll happily take the request_module_cap() part and the thing that
> makes networking use that.
>
> But the flag that we have to default to off because it breaks every
> single box otherwise? No. It doesn't matter if it's one single global
> or just a "global behavior for request_module() for this process" at
> that point, it's still a pointless security flag that is opt-in.
To be clear: such a flag wouldn't doesn't break every system, but I
understand your concern.
So what's the right path forward for allowing a way to block
autoloading? Separate existing request_module() calls into "must be
privileged" and "can be unpriv" first, then rework the series to deal
with the "unpriv okay" subset?
-Kees
--
Kees Cook
Pixel Security
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